#version 450 core

/*
* Copyright (c) 2018 Confetti Interactive Inc.
*
* This file is part of The-Forge
* (see https://github.com/ConfettiFX/The-Forge).
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements.  See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership.  The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License.  You may obtain a copy of the License at
*
*   http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied.  See the License for the
* specific language governing permissions and limitations
* under the License.
*/


out gl_PerVertex
{
	vec4 gl_Position;
};

layout(location = 0) out vec2 texcoord;

void main(void)
{
	vec4 p;
	uint id = gl_VertexIndex;
	p.x = (id == 2) ? 3.0 : -1.0;
	p.y = (id == 0) ? 3.0 : -1.0;
	p.z = 1.0;
	p.w = 1.0;

	gl_Position = p.xyzw;
	texcoord = p.xy * vec2(0.5, -0.5) + 0.5;
}